Buttons and menu.

I love this theme, i rate it 5 stars.
But, you can push it further.
The menu and buttons are ugly. You can use some framework for your theme development process. For example bootstrap will make your theme look even cooler.

Well there is always a second but.
If you make a theme for a international community, remember it will be translated.
So prepare it for translation and use fonts that support both Latin and Cyrillic!
Peace out! And keep it simple.